You don't need a different ECU if the FS add is correct, you only need the ECU to be socketed(if it isn't already) and then a Eprom chip. Chips can be purchased from
www.DSMChips.com or through a variety of other places. If you're going to tune with DSMLink, why are you looking at purchasing a custom Eprom chip? You had better start reading on your "plans" before you start purchasing things.